Fuel-injector.



0. REGENBOGEN.

FUEL INJECTOR. non F'QILED JUNE 10,1 V

Patented June 8, 1915.

CONRAD REGENBOGEN,

OF KIEL, GERMANY, ASSIGNOR TO FRIED. KRUPP AKTIEN- GESELLSCHAFT GERMANIAVJERFT.

' FUEL-1N3 ECTOR.

- tor'valve fed with fuel of low combustibility, for example, tar oil, it is essential that with reduced loads upon the machine, in which the fuel pump advances small quantities of fuel toward the nozzle, some fuel must. al-

ways bepresent in the annular space sur rounding the seat of the needle, at the time of opening thefpelneedle, since otherwise, when the needle is opened, cold pressure air will enter the cylinder in advance of the admission of the newly presented fuel,'which would hinder development of the conditions of ignition.

v The present invention has for its object to 1 provide a fuel injecting device which is so arranged that it, will insure certain ignition even with reduced loads upon the machine.

In the accompanying drawing is shown an embodiment of the invention by way of example.

Figure 1 shows in section a fuel injector device, and Fig. 2 a special arrangement of the regulatingdevice.

The arrangement of the particular fuel injector valve is known and consists essentiallyin a valve attachment A, the fuel needle B, the atomizing plates (1 and the atomizing cone D. The fuel is fed through a channel E, and the pressure air through a channel F. In accordance with the present invention, the annular space G lying immediately .above the seat of the needle B, is

connected with a space of low pressure, for example, with the outer atmosphere, through a channel H in which is located a cut-off slide This slide J is so controlled from a shaft K (for example the governor shaft) the medium of a cam disk L, L, that, at the end of the advancement of fuel through bythe fuel pump, and before the opening of the fuel ineedle B, it is opened for a brief time (a J the time-period indicated on'the drawinil and then immediately closes again. grhis temporary opening of the channel H produces in the nozzle, under the 1nfluence of the injector pressure air, a movement of the contents'of the nozzle toward the annular space G. If the annular space I Specification of Letters Patent. I

Patented June 8, 1915. Application filed June 10, 1912. Seria1No.702,840. 4

G, in consequence of a light load upon the machine, has been blown completely free of fuel, the pressure air which would be present 1n the space G at this time, can be dissipated through the channel H, and with the properly measured opening duration and opening capacity of the channel H, it can be replaced by fuel newly advanced through the atomizing plates 0 and the cone -D,, which fuel, after closure of the channel H and at the opening of the fuel needle, will be the.

first to reach the cylinder and will thus effect ignition with certainty.

Since with heavy loads upon the machine, such an exhaust of air from the annular space G is not necessary, forthe reason that the nozzle will not be blasted free of fuel, the control of the cut-off slide-J will be suitablyarranged in such a manner that the channel H will be opened only by an effort to transmit a'predetermined load. Moreover, for the sake of economy in pressure air, the arrangement of the control can be so determined that the channel will first open'but very'slightly with heavy loads on the engine and that the opening capacity or opening duration of the channel H gradually increases, attaining the highest extent when running light. This can be effected, with the describedcontrol, for example, by having the cam L designed asa cam, with variable lift, and having the cam-disk L s0 displaced, by the governor, on the shaft K,-

that thecontroller roll, runs upon the cylindrical portion of the cam-disk during the greatest load's, and with decreasing loads, gradually runs over upon the steeply ascending portions of the cam. An arrangement of this kind is represented in Fig. 2, showing the position of a cam disk L (corresponding to the cam disk L in Fig. 1) when the machine is running light and requires therefore the maximum opening capacity and maximum opening duration of the slide J. The sleeve m of the governor M will then occupy its highest position.

If the load upon the machine increases, the sleevem will descend, and, by means of the rod gear N O P displace the cam disk L to the left. By this movement, on'account of the cam L with variable lift,the

opening capacity and the opening duration of the slide J will continually decrease according to the increasing load uponthe machine, until, when the machine 15 under full lush load, the controller roll Will cooperate with stead oat through the cam disk.

I claim Lgln a valved fuel-injecting device for internahcombustion engines operating with fuels oflow combustibility; and having a needle -valve, and a housing therefor with a chamber inimediately behind the point of said needle valve; means through which said chamber can e brought momentarily into communication vvith a space having less pressure atthat moment, previous to opening the needle valve.

2. In a valved fuel-injecting device for internal combustionengines operating with fuels of 10W combustibility; and having a needle valve, and a housing therefor with a chamberimmediatcly behind the point of said needle valve; means through which said chamber can be'brought into communication with a space of pressure, previous to opening the needle valve, said means comprising a channel leading from said valve chamber to atmosphere and means for opening and closing said channel.

3. In a valved fuel-injecting device for internal combustion engines operating with fuels of low combustibility; and having a needle valve, and a housing therefor with a chamber immediately behind the point of said needle valve; means through Which said chamber can be brought into communication with a space of less pressure, previous to opening the needle valve, said means com-' prising a channel leading from said valve with a space of less pressure, previous to opening the needle valve, said means comprising a channel leading from said valve chamber to atmosphere, means for opening and closing said channel and means for timing and graduating the action of said opening and closing means.

5. In a valved fuel-injecting device for internal combustion engines operating with fuels of low combustibility; and having a needle valve, and a housing thereforv'ith a chamber immediately behind the point oi. said needle valve; means through which said chamber can be brought into communication with a space of less pressure, previous to openingthe needle valve, said means comprising a channel leading from said valve chamber to atmosphere, means for opening and closing said channel and means for timing and graduating the action of said opening and closing means, said timing and grad uating means being regulated to vary the area of the opening capacity of the channel closure, inversely as the load imposed upon. the engine. 1

In testimony whereof I have afiixcd my signature in presence of two witnesses.

CONRAD REGENBOGEN.

Witnesses:

C. WLLHELM Knurzrn'nnr, FERDINAND ROHWEDAN. 

